Adult clouded plant bugs,Neurocolpus nubilus(Say), were caged for 2 d on individual cotton plants (Gossypium hirsutumL.) during two stages of plant physiological development. Regression analyses of number of plant fruiting structures and yield on insect densities indicated that feeding byN. nubilusat the peak squaring period caused shedding of small pinhead squares and delayed crop maturation, although with no significant effects on total yield. The effects ofN. nubilusfeeding were less apparent at boll maturation. Observations of cotton fields with a history ofN. nubilusinfestations and analysis of data collected by the Mississippi Cooperative Extension Service in northern Mississippi indicated thatN. nubilusoverwinters in the egg stage, develops its population on several host plants, and moves to cotton during late season, when cotton is less susceptible to its damage.